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https://www.readbyqxmd.com/read/28099024/surface-interactions-and-confinement-of-methane-a-high-pressure-magic-angle-spinning-nmr-and-computational-chemistry-study
#1
Salim Ok, David W Hoyt, Amity Andersen, Julie Sheets, Susan A Welch, David R Cole, Karl Todd Mueller, Nancy M Washton
Characterization and modeling of the molecular-level behavior of simple hydrocarbon gases, such as methane, in the presence of both nonporous and nano-porous mineral matrices allows for predictive understanding of important processes in engineered and natural systems. In this study, changes in local electromagnetic environments of the carbon atoms in methane under conditions of high pressure (up to 130 bar) and moderate temperature (up to 346 K) were observed with 13C magic-angle spinning (MAS) NMR spectroscopy while the methane gas was mixed with two model solid substrates: a fumed non-porous, 12 nm particle size silica and a mesoporous silica with 200 nm particle size and 4 nm average pore diameter...
January 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28095286/the-relations-between-polycyclic-aromatic-hydrocarbons-exposure-and-1-ohp-levels-as-a-biomarker-of-the-exposure
#2
Zuzana Klöslová, Marek Drímal, Karol Balog, Kvetoslava Koppová, Jarmila Dubajová
BACKGROUND: Polycyclic aromatic hydrocarbons (PAHs) are the products of incomplete combustion or pyrolysis of various organic materials. Their ubiquity in the environment leads to measurable levels of exposure. However, the exposure varies strongly between different regions in Europe. Some PAHs with four or more rings are suspected to be human carcinogens. Therefore, the occupational and/or environmental exposure to PAHs may cause a significant health risk. The aim of investigation is to evaluate current levels of PAH exposure in defined groups of workers...
December 2016: Central European Journal of Public Health
https://www.readbyqxmd.com/read/28091808/occupational-and-environmental-scleroderma-systematic-review-and-meta-analysis
#3
Manuel Rubio-Rivas, Rafael Moreno, Xavier Corbella
The etiology of systemic sclerosis (SSc) remains unknown; however, several occupational and environmental factors have been implicated. Our objective was to perform a meta-analysis of all studies published on SSc associated with occupational and environmental exposure. The review was undertaken by means of MEDLINE and SCOPUS from 1960 to 2014 and using the terms: "systemic," "scleroderma," or "systemic sclerosis/chemically induced" [MesH]. The Newcastle-Ottawa Scale was used for the qualifying assessment. The inverse variance-weighted method was performed...
January 14, 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/28080046/application-of-2-aminothiazoline-4-carboxylic-acid-as-a-forensic-marker-of-cyanide-exposure
#4
Monika Rużycka, Joanna Giebułtowicz, Marcin Fudalej, Paweł Krajewski, Piotr Wroczyński
Cyanides are infamous for their highly poisonous properties. Accidental cyanide poisoning occurs frequently, but occasionally, intentional poisonings also occur. Inhalation of fumes generated by fire may also cause cyanide poisoning. There are many limitations in direct analysis of cyanide. 2-Aminothiazoline-4-carboxylic acid (ATCA), a cyanide metabolite, seems to be the only surrogate that is being used in the detection of cyanide because of its stability and its cyanide-dependent quality in biological matrix...
January 12, 2017: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/28074704/the-toxicology-of-zinc-chloride-smoke-producing-bombs-and-screens
#5
Ayman El Idrissi, Lisanne van Berkel, Nadia E Bonekamp, Diana J Z Dalemans, Marcel A G van der Heyden
CONTEXT: Zinc chloride (ZnCl2)-based smoke bombs and screens are in use since the Second World War (1939-1945). Many case descriptions on ZnCl2 smoke inhalation incidents appeared since 1945. OBJECTIVE: We provide a comprehensive overview of the clinical symptoms and underlying pathophysiology due to exposure to fumes from ZnCl2 smoke producing bombs. In addition, we give a historical overview of treatment regimens and their outcomes. METHODOLOGY: We performed a literature search on Medline, Scopus and Google Scholar databases using combinations of the following search terms "smoke bomb", "smoke screen", "ZnCl2", "intoxication", "poisoning", "case report", "HE smoke", "hexachloroethane smoke", "smoke inhalation" and "white smoke"...
January 11, 2017: Clinical Toxicology
https://www.readbyqxmd.com/read/28069970/lung-cancer-risk-in-welders-and-foundry-workers-with-a-history-of-heavy-smoking-in-the-usa-the-national-lung-screening-trial
#6
Jason Y Y Wong, Bryan A Bassig, Wei Jie Seow, Wei Hu, Bu-Tian Ji, Aaron Blair, Debra T Silverman, Qing Lan
OBJECTIVES: Foundry work is a risk factor for lung cancer; however, the association with welding is unclear, as smoking is common among metalworkers and may mask the relationship. We evaluated whether history of welding and foundry work, independently and jointly, and employment duration were associated with lung cancer risk in heavy smokers. METHODS: We analysed data from the National Lung Screening Trial, a prospective randomised trial of 53 454 heavy smokers (>30 pack-years) in the USA...
January 9, 2017: Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/28059426/the-effect-of-colloidal-aggregates-on-fat-crystal-networks
#7
Raamanand R Chauhan, Roel P A Dullens, Krassimir P Velikov, Dirk G A L Aarts
We investigate the role of a colloidal model system in the crystallization and network formation of lipids. This system consists of fractal fumed silica aggregates. We look at the influence of different solid fat concentrations and fumed silica concentrations on the resulting gel network. Oscillatory rheology shows that the addition of silica to fat-in-oil gels does not significantly affect the magnitude of the storage modulus within the linear viscoelastic region. Interestingly, the range of this region is increased...
January 6, 2017: Food & Function
https://www.readbyqxmd.com/read/28054104/inhalation-of-gas-metal-arc-stainless-steel-welding-fume-promotes-lung-tumorigenesis-in-a-j-mice
#8
Lauryn M Falcone, Aaron Erdely, Terence G Meighan, Lori A Battelli, Rebecca Salmen, Walter McKinney, Samuel Stone, Amy Cumpston, Jared Cumpston, Ronnee N Andrews, Michael Kashon, James M Antonini, Patti C Zeidler-Erdely
Epidemiologic studies suggest an increased risk of lung cancer with exposure to welding fumes, but controlled animal studies are needed to support this association. Oropharyngeal aspiration of collected "aged" gas metal arc-stainless steel (GMA-SS) welding fume has been shown by our laboratory to promote lung tumor formation in vivo using a two-stage initiation-promotion model. Our objective in this study was to determine whether inhalation of freshly generated GMA-SS welding fume also acts as a lung tumor promoter in lung tumor-susceptible mice...
January 4, 2017: Archives of Toxicology
https://www.readbyqxmd.com/read/28052400/programmed-death-1-ligand-1-and-2-expression-in-cutaneous-squamous-cell-carcinoma-and-their-relationship-with-tumor-infiltrating-dendritic-cells
#9
Qingqing Jiao, Cuiping Liu, Wenzhong Li, Wei Li, Fuming Fang, Qihong Qian, Xueguang Zhang
The Programmed Death-1 (PD-1) receptor ligands, PD-L1 and PD-L2, are costimulatory molecules that contribute to the negative regulation of T-lymphocyte activation. It is still unclear whether there is correlation between PD-L1 or PD-L2 and tumor infiltrating dendritic cells (TIDCs) in cutaneous squamous cell carcinoma (CSCC). The aim of this study was to analyze PD-L1 and PD-L2 expression and dendritic cells (DCs) infiltration in tumor tissue of CSCC patients and investigate their clinical significance. Immunohistochemical analysis was used to evaluate the expression of PD-L1, PD-L2, CD1a, and CD83 in 61 CSCC tissues...
January 3, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28035608/emission-and-distribution-of-pcdd-fs-chlorobenzenes-chlorophenols-and-pahs-from-stack-gas-of-a-fluidized-bed-and-a-stoker-waste-incinerator-in-china
#10
Tianjiao Wang, Tong Chen, Xiaoqing Lin, Mingxiu Zhan, Xiaodong Li
The concentrations, homologue, and congener profiles, as well as the gas/particle distribution of polychlorinated dibenzo-p-dioxins and furans (PCDD/Fs), chlorobenzenes (CBzs), chlorophenols (CPhs), and polyaromatic hydrocarbons (PAHs) from stack gas of two different municipal solid waste incinerators in China, were characterized. The incinerators were a stoker furnace incinerator equipped with the advanced air pollution control device (APCD) and a common circulating fluidized bed (CFB) furnace. The concentration of PCDD/Fs in the stack gas of the stoker incinerator ranged 0...
December 29, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28032061/indoor-environmental-factors-and-occurrence-of-lung-function-decline-in-adult-residents-in-summer-in-southwest-china
#11
Yu Jie, Li Kebin, Tang Yin, Xu Jie
BACKGROUND: There is conflicting reports on the respiratory health effects of indoor risk factor exposure. The aim of this study was to assess the association of indoor environmental factors to pulmonary function in an adult population in Zunyi City of Southwest China. METHODS: Between July and Sep 2012, we conducted a cross-sectional survey of people aged ≥18 yr in 11 inner-city areas of Zunyi. Data on asthma and asthma-related symptoms and selected home environmental factors were assessed by questionnaire...
November 2016: Iranian Journal of Public Health
https://www.readbyqxmd.com/read/28031461/heparan-sulfate-domains-required-for-fibroblast-growth-factor-1-and-2-signaling-through-fibroblast-growth-factor-receptor-1c
#12
Victor Schultz, Mathew Suflita, Xinyue Liu, Xing Zhang, Yanlei Yu, Lingyun Li, Dixy E Green, Yongmei Xu, Fuming Zhang, Paul L DeAngelis, Jian Liu, Robert J Linhardt
A small library, of well-defined heparan sulfate (HS) polysaccharides, was chemoenzymatically synthesized and used for a detailed structure-activity study of fibroblast growth factor (FGF)1 and FGF2 signaling through FGF receptor (FGFR)1c. The HS polysaccharide tested contained both undersulfated (NA) domains and highly sulfated (NS) domains as well as very well defined non-reducing termini. This study examines differences in the HS selectivity of the positive canyons of the FGF12-FGFR1c2 and FGF22-FGFR1c2 HS-binding sites of the symmetric FGF2-FGFR2HS2 signal transduction complex...
December 28, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28031394/dose-dependent-progression-of-parkinsonism-in-manganese-exposed-welders
#13
Brad A Racette, Susan Searles Nielsen, Susan R Criswell, Lianne Sheppard, Noah Seixas, Mark N Warden, Harvey Checkoway
OBJECTIVE: To determine whether the parkinsonian phenotype prevalent in welders is progressive, and whether progression is related to degree of exposure to manganese (Mn)-containing welding fume. METHODS: This was a trade union-based longitudinal cohort study of 886 American welding-exposed workers with 1,492 examinations by a movement disorders specialist, including 398 workers with 606 follow-up examinations up to 9.9 years after baseline. We performed linear mixed model regression with cumulative Mn exposure as the independent variable and annual change in Unified Parkinson Disease Rating Scale motor subsection part 3 (UPDRS3) as the primary outcome, and subcategories of the UPDRS3 as secondary outcomes...
December 28, 2016: Neurology
https://www.readbyqxmd.com/read/28017465/refractory-hypoxemic-respiratory-failure-from-metal-fume-inhalation-emergency-department-procedure
#14
Hong Joon Ahn, Jun Wan Lee, Seung Ryu, Yong Chul Cho, Won Joon Jeong
No abstract text is available yet for this article.
December 12, 2016: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28011282/1-2-indanedione-a-winning-ticket-for-developing-fingermarks-a-validation-study
#15
Michal Levin-Elad, Yakir Liptz, Karni L Bar-Or, Joseph Almog
1,2-Indanedione has been extensively researched since the discovery of its fluorogenic reaction with amino acids in 1997 by Joullié et al. [1]. This current study compares the development of fingermarks on used train tickets by the three leading reagents for amino acids-ninhydrin, DFO and 1,2-indanedione. The train tickets are ideal for the task due to their high abundance and frequent use by a diverse population. However, their unique double-layer composition of a cellulose-based regular paper on one side and a thermally sensitive layer on the other requires an adjustment of the traditional development procedures...
December 14, 2016: Forensic Science International
https://www.readbyqxmd.com/read/28011077/top-down-and-bottom-up-analysis-of-commercial-enoxaparins
#16
Xinyue Liu, Kalib St Ange, Lei Lin, Fuming Zhang, Lianli Chi, Robert J Linhardt
A strategy for the comprehensive analysis of low molecular weight (LMW) heparins is described that relies on using an integrated top-down and bottom-up approach. Liquid chromatography-mass spectrometry, an essential component of this approach, is rapid, robust, and amenable to automated processing and interpretation. Nuclear magnetic resonance spectroscopy provides complementary top-down information on the chirality of the uronic acid residues comprising a low molecular weight heparin. Using our integrated approach four different low molecular weight heparins prepared from porcine heparin through chemical β-eliminative cleavage were comprehensively analyzed...
January 13, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28007564/structural-analysis-of-heparin-derived-3-o-sulfated-tetrasaccharides-antithrombin-binding-site-variants
#17
Yin Chen, Lei Lin, Isaac Agyekum, Xing Zhang, Kalib St Ange, Yanlei Yu, Fuming Zhang, Jian Liu, I Jonathan Amster, Robert J Linhardt
Heparin is a polysaccharide that is widely used as an anticoagulant drug. The mechanism for heparin's anticoagulant activity is primarily through its interaction with a serine protease inhibitor, antithrombin III (AT), that enhances its ability to inactivate blood coagulation serine proteases, including thrombin (factor IIa) and factor Xa. The AT-binding site in the heparin is one of the most well-studied carbohydrate-protein binding sites and its structure is the basis for the synthesis of the heparin pentasaccharide drug, fondaparinux...
December 20, 2016: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28007544/powder-compression-mechanics-of-spray-dried-lactose-nanocomposites
#18
Joel Hellrup, Josefina Nordström, Denny Mahlin
The aim of this study was to investigate the structural impact of the nanofiller incorporation on the powder compression mechanics of spray-dried lactose. The lactose was co-spray-dried with three different nanofillers, that is, cellulose nanocrystals, sodium montmorillonite and fumed silica, which led to lower micron-sized nanocomposite particles with varying structure and morphology. The powder compression mechanics of the nanocomposites and physical mixtures of the neat spray-dried components were evaluated by a rational evaluation method with compression analysis as a tool, using the Kawakita equation and the Shapiro-Konopicky-Heckel equation...
December 19, 2016: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/27992721/a-hamiltonian-matrix-correction-based-density-functional-valence-bond-method
#19
Chen Zhou, Yang Zhang, Xiping Gong, Fuming Ying, Peifeng Su, Wei Wu
In this work, a valence bond type multi-reference density functional theory (MRDFT) method, called Hamiltonian matrix correction based density functional valence bond method (hc-DFVB), is presented. In hc-DFVB, the static electronic correlation is considered by the valence bond self-consistent field (VBSCF) strategy, while the dynamic correlation energy is taken into account by Kohn-Sham density functional theory (KS-DFT). Different from our previous version of DFVB (J. Chem. Theory Comput. 2012, 8, 1608), hc-DFVB corrects the dynamic correlation energy with a Hamiltonian correction matrix, improving the functional adaptability and computational accuracy...
December 19, 2016: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/27987755/controlled-release-of-cefazolin-sodium-antibiotic-drug-from-electrospun-chitosan-polyethylene-oxide-nanofibrous-mats
#20
Yousef Fazli, Zahra Shariatinia
Antimicrobial electrospun chitosan-polyethylene oxide (CS-PEO) nanofibrous mats containing cefazolin, fumed silica (F. silica) and cefazolin-loaded fumed silica nanoparticles (NPs) were produced for biomedical applications. The FE-SEM images revealed that the F. silica and F. silica-cefazolin NPs had average diameters of 40±10 and 60±15nm, respectively. Also, the fibers diameters were approximately 160±30, 90±20 and 70±15nm for the pure CS-PEO, CS-PEO-1% F. silica and CS-PEO-1% F. silica-0.5% cefazolin nanofibrous mats, respectively indicating addition of F...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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